IHTM20634 - Life Policies: annuities payable to deceased/transferor by insurance companies: annuities which continue after the death
The payments under a purchased life annuity which continues after death are an asset of the deceased’s estate if the legal personal representatives are entitled to receive them.
The open market value of these payments should be returned at Box 8 of form IHT410 and you should follow the procedural instructions at IHTM20025.